Flip-up ladder



FIG. 1 is a front perspective view of a flip-up ladder;

FIG. 2 is a front view of the flip-up ladder shown in FIG. 1;

FIG. 3 is a rear view of the flip-up ladder shown in FIG. 1;

FIG. 4 is a is right side view of the flip-up ladder shown in FIG. 1;

FIG. 5 is a left side view of the flip-up ladder shown in FIG. 1;

FIG. 6 is a top side view of the flip-up ladder shown in FIG. 1; and,

FIG. 7 is a bottom view of the flip-up ladder shown in FIG. 1. 

CLAIM The ornamental design for a flip-up ladder, as shown and described. 